等离子体密度对激光拉曼放大机理的影响

张智猛; 张博; 吴凤娟; 洪伟; 滕建; 贺书凯; 谷渝秋

doi:10.7498/aps.64.105201

摘要

等离子体中的背向拉曼散射机理可以用来产生超短超强的激光脉冲. 本文采用粒子模拟方法模拟研究了等离子体密度对激光拉曼放大过程的影响. 研究发现, 过低的等离子体密度会导致等离子体波提前波破而降低能量转换效率; 而过高的等离子体密度又会导致其他不稳定性的快速增长, 限制作用距离和输出能量. 因此, 拉曼放大机理的最佳等离子体密度应处于等离子体波破的密度阈值附近, 可以获得最高的能量转换效率和能量输出. 另外, 空间频谱分析显示放大激光的强度饱和主要来自于自相位调制不稳定性的发展. 利用1013 W·cm-2的抽运激光脉冲, 模拟证实拉曼放大机理可有效地将种子激光的强度从1013 W·cm-2 放大到1017 W·cm-2, 脉宽压缩到40 fs, 且能量转换效率达到58%.

关键词:

Abstract

Backward Raman amplification (BRA) in plasma can be used for generating ultra-powerful laser pulses. In this paper, the plasma density effect on backward Raman laser amplification is studied by using particle-in-cell method. It is found that using a low plasma density can lead to the premature Langmuir wave breaking and thus result in a small energy-transfer efficiency. On the other hand, using a high plasma density will enhance the developments of unwanted instabilities, which rapidly disturb the Raman amplification, thus limiting the interaction length and output power. Therefore, an optimal plasma density for BRA is near the threshold of Langmuir wave breaking in order to achieve both high efficiency and large energy flux. The space frequency spectrum analysis shows that the saturated intensity of amplified pulses is limited mainly by the self-phase modulation instability. By using a 1013 W·cm-2 pump pulse, our simulation results show that the initial 1013 W·cm-2 seed pulse can be well be well amplified into a pulse with an energy power of 1017 W·cm-2, a duration of 40 fs, and and an energy conversion efficiency of up to 58%.

Keywords:

作者及机构信息

1.
中国工程物理研究院激光聚变研究中心, 等离子体物理重点实验室, 绵阳 621900;

2.
西南科技大学国防科技学院, 绵阳 621010;

3.
北京大学应用物理与技术研究中心, 北京 100088

基金项目: 国家自然科学基金(批准号: 11305157)和等离子体重点实验室基金(批准号: 9140C680604130C68245)资助的课题.

Authors and contacts

1.
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China;

2.
School of National Defense Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China;

3.
Center for Applied Physics and Technology, Peking University, Beijing 100088, China

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11305157), and Foundation of Science and Technology on Plasma Physics Laboratory, China (Grant No. 9140C680604130C68245).

参考文献

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[3]	Hinkel D E 2013 Nucl. Fusion 53 104027
[4]	Esarey E, Schroeder C B, Leemans W P 2009 Rev. Mod. Phys. 81 1229
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[7]	Lichters R, Meyer-ter-Vehn J, Pukhov A 1996 Phys. Plasmas 3 3425
[8]	Esirkepov T Zh, Bulanov S V, Kando M, Pirozhkov A S, Zhidkov A G 2009 Phys. Rev. Lett. 103 025002
[9]	Ji L L, Shen B F, Li D X, Wang D, Leng Y X, Zhang X M, Wen M, Wang W P, Xu J C, Yu Y H 2010 Phys. Rev. Lett. 105 025001
[10]	Strickland D, Mourou G 1985 Opt. Commun. 56 219
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[12]	Malkin V M, Shvets G, Fisch N J 1999 Phys. Rev. Lett. 82 4448
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[14]	Tang Y H, Han S S, Zhang C X, Wu Y Q, Cheng J, Zhong F C Zhu Y Z, Xu Z Z 2002 Chin. Phys. 11 50
[15]	Zhou C L, Ye W H, Lu X P 2014 Acta Phys. Sin. 63 085207 (in Chinese) [邹长林, 叶文华, 卢新培 2014 物理学报 63 085207]
[16]	Ping Y, Geltner I, Fisch N J, Shvets G, Suckewer S 2000 Phys. Rev. E 62 4532
[17]	Ping Y, Cheng W, Suckewer S, Clark D S, Fisch N J 2004 Phys. Rev. Lett. 92 175007
[18]	Dreher M, Takahashi E, Meyer-ter-Vehn J, Witter K J 2004 Phys. Rev. Lett. 93 095001
[19]	Cheng W, Avitzour Y, Ping Y, Suckewer S, Fisch N J, Hur M S, Wurtele J S 2005 Phys. Rev. Lett. 94 045003
[20]	Ren J, Cheng W F, Li S L, Suckewer S 2007 Nat. Phys. 3 732
[21]	Clark D S, Fisch N J 2003 Phys. Plasmas 10 4848
[22]	Yampolsky N A, Fisch N J 2009 Phys. Plasmas 16 072105
[23]	Zhang Z M, He X T, Sheng Z M, Yu M Y 2011 Phys. Plasmas 18 023110
[24]	Fraiman G M, Yampolsky N A, Malkin V M, Fisch N J 2002 Phys. Plasmas 9 3617
[25]	Wang T L, Clark D S, Strozzi D J, Wilks S C, Martins S F, Kirkwood R K 2010 Phys. Plasmas 17 023109
[26]	Malkin V M, Toroker Z, Fisch N J 2012 Phys. Plasmas 19 023109

施引文献

[1]	Zhang J T, He B, He X T, Chang T Q, Xu L B, Andereev N E 2001 Acta Phys. Sin. 50 921 (in Chinese) [张家泰, 何斌, 贺贤土, 常铁强, 许林宝, 安德列夫 N E 2001 物理学报 50 921]
[2]	Tabak M, Hammer J, Glinsky M E, Kruer W L, Wilks S C, Woodworth J, Campbell E M, Perry M D, Mason R J 1994 Phys. Plasma 1 1626
[3]	Hinkel D E 2013 Nucl. Fusion 53 104027
[4]	Esarey E, Schroeder C B, Leemans W P 2009 Rev. Mod. Phys. 81 1229
[5]	Zhou C T, Wang X G, Wu S Z, Cai H B, Wang F, He X T 2010 Appl. Phys. Lett. 97 201502
[6]	Zhang Z M, He X T, Sheng Z M, Yu M Y 2012 Appl. Phys. Lett. 100 134103
[7]	Lichters R, Meyer-ter-Vehn J, Pukhov A 1996 Phys. Plasmas 3 3425
[8]	Esirkepov T Zh, Bulanov S V, Kando M, Pirozhkov A S, Zhidkov A G 2009 Phys. Rev. Lett. 103 025002
[9]	Ji L L, Shen B F, Li D X, Wang D, Leng Y X, Zhang X M, Wen M, Wang W P, Xu J C, Yu Y H 2010 Phys. Rev. Lett. 105 025001
[10]	Strickland D, Mourou G 1985 Opt. Commun. 56 219
[11]	Shvets G, Fisch N J, Pukhov A, Meyer-ter-Vehn J 1998 Phys. Rev. Lett. 81 4879
[12]	Malkin V M, Shvets G, Fisch N J 1999 Phys. Rev. Lett. 82 4448
[13]	Mourou G A, Fisch N J, Malkin V M, Toroker Z, Khazanov E A, Sergeev A M, Tajima T, Garrec B L 2012 Opt. Commun. 285 720
[14]	Tang Y H, Han S S, Zhang C X, Wu Y Q, Cheng J, Zhong F C Zhu Y Z, Xu Z Z 2002 Chin. Phys. 11 50
[15]	Zhou C L, Ye W H, Lu X P 2014 Acta Phys. Sin. 63 085207 (in Chinese) [邹长林, 叶文华, 卢新培 2014 物理学报 63 085207]
[16]	Ping Y, Geltner I, Fisch N J, Shvets G, Suckewer S 2000 Phys. Rev. E 62 4532
[17]	Ping Y, Cheng W, Suckewer S, Clark D S, Fisch N J 2004 Phys. Rev. Lett. 92 175007
[18]	Dreher M, Takahashi E, Meyer-ter-Vehn J, Witter K J 2004 Phys. Rev. Lett. 93 095001
[19]	Cheng W, Avitzour Y, Ping Y, Suckewer S, Fisch N J, Hur M S, Wurtele J S 2005 Phys. Rev. Lett. 94 045003
[20]	Ren J, Cheng W F, Li S L, Suckewer S 2007 Nat. Phys. 3 732
[21]	Clark D S, Fisch N J 2003 Phys. Plasmas 10 4848
[22]	Yampolsky N A, Fisch N J 2009 Phys. Plasmas 16 072105
[23]	Zhang Z M, He X T, Sheng Z M, Yu M Y 2011 Phys. Plasmas 18 023110
[24]	Fraiman G M, Yampolsky N A, Malkin V M, Fisch N J 2002 Phys. Plasmas 9 3617
[25]	Wang T L, Clark D S, Strozzi D J, Wilks S C, Martins S F, Kirkwood R K 2010 Phys. Plasmas 17 023109
[26]	Malkin V M, Toroker Z, Fisch N J 2012 Phys. Plasmas 19 023109

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